CVE-2026-63266

UNKNOWN 0.0

Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.

CWE	CWE-22
Vendor	the document foundation
Product	libreoffice
Published	Oct 5, 2026
Last Updated	Oct 5, 2026

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Affected Versions

The Document Foundation / LibreOffice

26.2 < < 26.2.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

libreoffice.org: https://www.libreoffice.org/about-us/security/advisories/cve-2026-63266

Credits

🔍 Thomas Rinsma and Edoardo Geraci from Codean Labs Caolán McNamara of Collabora Productivity